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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. typedef long long ll;
  4. const ll p = 1e9 + 7;
  5. ll n, L, R, q;
  6. ll add(ll x, ll y){return (x % p + y % p + p) % p;}
  7. ll mul(ll x, ll y){return (x % p * y % p) % p;}
  8.  
  9. ll C(ll x){
  10.     if(x < 2) return 0LL;
  11.     if(x == 2) return 1LL;
  12.     ll a = x;
  13.     ll b = x - 1;
  14.     if(b % 2 == 0) b /= 2;
  15.     else a /= 2;
  16.     return mul(a, b);
  17. }
  18.  
  19. int main(){
  20.     freopen("love.inp", "r", stdin);
  21.     freopen("love.out", "w", stdout);
  22.     cin >> q;
  23.     while(q--){
  24.         cin >> L >> R >> n;
  25.         ll a = C(R - L + 1) + R - L + 1;
  26.         ll newL = (L - 1) / n, newR = R / n;
  27.         ll b = add(C(R / n - (L - 1) / n), (newR - newL));
  28.         cout << a - b << endl;
  29.     }
  30.  
  31. }
Success #stdin #stdout 0.01s 5288KB
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https://ideone.com/f5udOb
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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